“Corrected when found” – 20 children’s malocclusion that must be dealt with before the age of 12 Anti-collision, commonly known as “parietal”, that is, the lower row of teeth wrapped around the upper row of teeth. It seriously affects the appearance of the face, leads to eating, chewing function decline, aggravate the burden on the stomach and intestines, thus affecting physical health. Sometimes it also affects pronunciation, which can lead to ridicule and mental health problems. Individual tooth anticlocking, i.e. individual incisors or two teeth anticlocking, is extremely harmful. It can affect the normal development of the upper face, with a concave upper lip. And, the potential for harm is that it is most likely to lead to TMJ disorder disease in children as they grow into their 30s and 40s. Deviated jaw. Due to dental caries or missing teeth on one side, etc., eating with the other side for a long time or other reasons, resulting in bilateral facial asymmetry, which seriously affects the child’s mental health and self-esteem. Severe big buck (storm) teeth. Buck teeth patients are very unconfident, so they dare not communicate with others and dare not smile, which greatly affects schooling and socializing, and some children become inferior, which should also be corrected in time. Jaw retraction. Underdeveloped jaw, small chin, commonly known as bird’s beak. It affects facial aesthetics, and also affects function because the lower row of teeth is too narrowly aligned, limiting the development of the upper row of teeth. Severe crowding during replacement teeth. General mild crowding during the replacement teeth can be observed and not dealt with for the time being; in serious cases, it is manifested as misalignment of individual or multiple teeth in various directions; and crowding of teeth also prevents local teeth from being cleaned and is prone to tooth decay and gingivitis. Early loss of milk teeth. Premature loss of milk teeth without replacement time will make the local jawbone underdevelopment, and the position of missing teeth can be partially or even completely occupied due to the displacement of neighboring teeth, so that the permanent teeth will erupt in the wrong position or ambush and form malocclusion. Retained milk teeth. Milk teeth are still not lost and retired when it is time to replace them, which leads to the obstruction of the eruption of the succeeding permanent teeth, resulting in the abnormal eruption order, or misplaced eruption, or ambulatory obstruction, which leads to the incorrect alignment of the teeth and the malocclusion. Open-mouth breathing during sleep. This condition is mostly due to nasal blockage or adenoid hypertrophy and other causes of poor nasal breathing, which can cause lip ectropion and short and thick lips, high arch of the palate narrowing of the face, anterior protrusion, a long face shape, receding chin and back teeth not biting together. Multiple teeth. Extra teeth in the mouth, especially between the upper incisors. Most of the supernumerary teeth are malformed and they occupy the position of normal teeth, resulting in misalignment or impaired eruption of these normal teeth. Non-eruption or ambulatory obstruction of permanent teeth. An ambulatory obstruction is a tooth that partially erupts or fails to erupt at all and will not be able to erupt in the future. Incisors are common in childhood. It can be improved by methods such as eruption aids or traction. Snoring during sleep. Snoring due to nasal obstruction, incorrect breathing pattern and incorrect bite of upper and lower teeth will lead to facial deformities in the long run, such as narrow and long face, exposed lower teeth, open lips and exposed teeth, which will seriously affect the appearance of the child. Cavities are not repaired in time. The position occupied by milk teeth becomes smaller due to tooth decay, which will make the permanent teeth not have enough position when they are erupting, so there will be crowding and irregularity, and even affect the replacement and eruption of the inherited permanent teeth. Therefore, it is necessary to fill the rotten milk teeth. Abnormal labial tie. The labial tie attaches between the outer gums and the alveolar mucosa between the two upper middle incisors, and if the tie does not recede as the child grows older, it can lead to a large gap between the upper incisors. Abnormal tongue tie. A congenital developmental abnormality. The tongue tie is too short, restricting normal tongue movement, and in severe cases, the tongue cannot extend beyond the mouth or touch the upper lip. Interferes with suckling, phonation and articulation. Post-operative cleft lip and palate. Not all is well after cleft lip and palate surgery, but a series of orthodontic treatments up to several years must be required to maximize good appearance and physiological function. Adverse Lip Habits. This includes biting the lower lip, sucking on the lower lip, and the lower lip pocketing the upper lip. This can result in an overly short upper lip, an open lip, and an ingrown lower lip. Poor finger-sucking habits. Finger-sucking behaviors that persist after the age of 3 can result in malformations such as the front teeth not biting together, the child’s upper and lower incisors protruding forward, and, in severe cases, can affect upper and lower bone development and result in facial deformities. Bad tongue habits. Stretching the tongue, spitting, licking the tongue, tongue, etc. are bad tongue habits, will cause teeth outward misalignment, protrusion, gap, teeth bite together or Baodian, etc., must be corrected in a timely manner. Early loss of permanent teeth. Children grow the first permanent molar, that is, the first molar. There are four of them, one on each side of the mouth and one on each side of the mouth. Generally, this tooth erupts around the age of six, so it is commonly known as the “six-year-old teeth”. “The six-year-old teeth have the highest caries rate, and the percentage of extractions and the incidence of other dental diseases are higher than those of other teeth. Functionally speaking, these teeth are the most important molars, and the loss of the six-year-old teeth will easily lead to misalignment of the teeth, and orthodontic treatment will be much more difficult, so it is important to pay special attention to the protection of the “six-year-old teeth”.